In this paper it was considered a model of heterogeneity of vector field within an associative algebra (Clifford algebra) on four - dimensional curvilinear coordinates. It is shown a possibility to get the equations of electrodynamics from model: systems of equations of Maxwell as a single equation, conservation laws 4-current and Einstein field equations. The geometrical interpretation was given for 4- current and a non-trivial "law of conservation of 4-dimensional curl of current" was received.

Maryna, Dei & Olha, Rudenko (Ed.) (2018). Association agreement: from partnership to cooperation (collective monograph). Hamilton, Ontario: Accent Graphics Communications & Publishing. The collective monograph is devoted to the actual issues concerning the implementation of the Association Agreement between Ukraine and the member states of the European Union. In particular, the monograph examines the theoretical and practical aspects of various spheres of joint activities, as a commitment to economic development in Ukraine. Created for scholars, research workers, postgraduates and students of higher education institutions, as well as for all those interested in the implementation of the Association Agreement.

Стилизованное изображение мифического существа Пегаса, внутри которого видны механизмы, а сам он сделан из природных материалов - шишки, желудя и листьев. Фирменное наименование "Шишкин друг" выполнено стилизованным под дерево шрифтом на двух языках - русском и английском (слово "шишкин" просто транслитировано)и расположено ниже знака в виде Пегаса.